1.方管的横截面是规则的四边形，就像一个空心的钢铁盒子，四个边的长度可以相同（称为方管）或不同（称为矩形管），这种结构让它兼具两大优势：

The cross-section of a square tube is a regular quadrilateral, like a hollow steel box. The lengths of the four sides can be the same (called a square tube) or different (called a rectangular tube), which gives it two major advantages:

承重能力强：相同截面积下，方管的抗弯强度比圆管高 30% 以上，因为方形截面的棱角分布能更均匀地分散压力。例如，搭建脚手架时，边长 40 毫米、壁厚 3 毫米的方管，单根可承重 500 公斤，适合作为垂直支撑柱，稳定可靠。

Strong load-bearing capacity: Under the same cross-sectional area, the bending strength of square pipes is more than 30% higher than that of round pipes, because the angular distribution of square sections can more evenly distribute pressure. For example, when building scaffolding, a square tube with a side length of 40 millimeters and a wall thickness of 3 millimeters can support a single weight of 500 kilograms, making it suitable as a vertical support column and stable and reliable.

连接便捷：方管的直角边便于焊接、螺栓固定或卡扣连接，无需复杂的圆弧加工。在家具制作中，方管的四个平面可以直接与板材贴合，用螺丝固定后形成牢固的框架，比圆管节省 30% 的连接时间。

Convenient connection: The right angled edges of the square tube are easy to weld, bolt, or snap connect, without the need for complex arc machining. In furniture production, the four flat surfaces of square tubes can be directly attached to the board and fixed with screws to form a sturdy frame, saving 30% of connection time compared to round tubes.

2.多样材质：适配不同场景的 “钢铁外衣”

2. Diverse materials: "Steel outerwear" suitable for different scenarios

济南方管的材质选择丰富，每种材质都像为特定环境定制的 “防护铠甲”：

Jinan square tube has a wide selection of materials, each of which is like a customized "protective armor" for a specific environment:

碳钢方管

Carbon steel square tube

以 Q235B 碳钢为原料，表面多做镀锌处理（热镀锌或电镀锌），锌层厚度 8-275 克 / 平方米，就像给钢材穿上 “防锈外套”。这种方管性价比高，适合室内干燥环境或普通户外场景，如建筑中的隔墙龙骨、工厂的设备支架。例如，家庭装修中常用的边长 20×40 毫米、壁厚 1.5 毫米的碳钢方管，搭配木质板材制成书架，既承重又不易生锈。

Using Q235B carbon steel as raw material, the surface is treated with galvanizing (hot-dip galvanizing or electroplating), with a zinc layer thickness of 8-275 grams per square meter, just like putting a "rust proof jacket" on the steel. This type of square tube has a high cost performance ratio and is suitable for indoor dry environments or ordinary outdoor scenes, such as wall studs in buildings and equipment brackets in factories. For example, the commonly used carbon steel square tube with a side length of 20 × 40 millimeters and a wall thickness of 1.5 millimeters in home decoration, combined with wooden boards to make bookshelves, not only bears weight but is also not easy to rust.

不锈钢方管

Stainless steel square tube

采用 304 或 316 不锈钢，表面光滑且耐腐蚀，能抵抗济南空气中的湿气和轻微酸雨，适合潮湿环境或对美观要求高的场所。304 不锈钢方管常见于商场的扶手、酒店的装饰框架，316 不锈钢方管则用于化工车间的耐腐蚀管道，即使长期接触水汽或腐蚀性液体，也能保持表面光洁，使用寿命可达 20 年以上。

Made of 304 or 316 stainless steel, the surface is smooth and corrosion-resistant, able to resist moisture and slight acid rain in Jinan air, suitable for humid environments or places with high aesthetic requirements. 304 stainless steel square tube is commonly used in handrails in shopping malls and decorative frames in hotels, while 316 stainless steel square tube is used for corrosion-resistant pipelines in chemical workshops. Even if it comes into long-term contact with water vapor or corrosive liquids, it can maintain a smooth surface and have a service life of over 20 years.

铝合金方管

Aluminum alloy square tube

重量仅为碳钢的 1/3，表面经阳极氧化处理形成致密氧化膜，轻便耐用且无需额外防锈，适合对承重要求不高但需要灵活移动的场景。济南的户外广告架、展览展示架常使用铝合金方管，边长 30×50 毫米、壁厚 1.2 毫米的规格，既能支撑广告画面，又便于运输和安装。

The weight is only one-third of carbon steel, and the surface has been anodized to form a dense oxide film. It is lightweight, durable, and does not require additional rust prevention, making it suitable for scenarios that do not require high load-bearing requirements but require flexible movement. Outdoor advertising and exhibition display stands in Jinan often use aluminum alloy square tubes with a side length of 30 × 50 millimeters and a wall thickness of 1.2 millimeters, which can support advertising images and facilitate transportation and installation.

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